Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 299
IONS. of the screw by a grooved key, whicli is held by a set screw. At the back ofthis key there is a clearance space sufficient to allow of the key being with-drawn clear of the grooves, so that the lever may be turned on the screw intoanother position and take up the wear of the screw threads.… … Fig. 623. Fig. 624. The shaft to be clutched is provided with a block F, capable of sliding alongand approaching 0 D until it is in contact. It follows, therefore, that when thewire B is traversed by a current, F is attracted against C D and participates inthe motion of A. Adhesion is obtained…
Mechanical drawing
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